The archive insylan.tar should contain the following .m files and
data files:

defpencil.m   Generates a defective matrix pencil.
getmat.m      Retrieve data structures for sample problems.
insydrv.m     Driver for indefinite symmetric Lanczos algorithm.
insylan.m     Indefinite symmetric Lanczos recurrence.
linsol.m      Solves linear system (A-sigma*B)y =z.
matvec.m      Performs matrix vector multiply y=B*x.
solvred.m     Solves reduced problem T*z = (theta)*Omega*z
reortho.m     Monitors and corrects loss of orthogonality.
insytst.m     Runs test problems.

Data files (see the file getmat.m for more info):
speaker107.mat
speaker107eig.mat
speaker334.mat
speaker334eig.mat
speaker538.mat
speaker538eig.mat
shaft400.mat
shaft400eig.mat
shaft80M.m
shaft80C.m
shaft80K.m
shaft80Msing.m

